DOI: 10.1140/epja/i2002-10158-9
Observation of
correlations from
collisions
V. Koptev1, M. Nekipelov1, 2, M. Büscher2, S. Dymov2, 3, M. Hartmann2, V. Hejny2, H.R. Koch2, N. Lang4, S. Mikirtichyants1, H. Ohm2, A. Petrus3, Z. Rudy2, 5, R. Schleichert2, A. Sibirtsev2, K. Sistemich2, H. Ströher2 and K.-H. Watzlawik2
1 High Energy Physics Department, Petersburg Nuclear Physics Institute, 188350 Gatchina, Russia
2 Institut für Kernphysik, Forschungszentrum Jülich, D-52425 Jülich, Germany
3 Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia
4 Institut für Kernphysik, Universität Münster, W.-Klemm-Str. 9, D-48149 Münster, Germany
5 M. Smoluchowski Institute of Physics, Jagellonian University, Reymonta 4, PL-30059 Cracow, Poland
m.buescher@fz-juelich.de
(Received: 26 November 2002 / Revised version: 24 March 2003 / Published online: 20 May 2003)
Abstract
Results of a first experiment on (
K+p) and (
K+d)
correlations from proton-carbon (
pC) and proton-deuteron (
pd)
interactions at beam energies above and much below the threshold for
elementary kaon production in nucleon-nucleon reactions
(
TNN=1580 MeV) are discussed. These data, obtained with the
ANKE spectrometer at COSY-Jülich, provide first direct evidence
for
K+ production via the two-step mechanism and an indication
for a cluster mechanism. It is shown that both processes contribute
significantly in
pC collisions at 1200 MeV, while they are
strongly suppressed at 2300 MeV and also in
pd-interactions at
1344 MeV. It is emphasized that the underlying kinematics can be
exploited to distinguish between these reaction mechanisms.
13.60.Le - Meson production.
13.75.Jz - Kaon-baryon interactions.
14.40.Aq -


25.10.+s - Nuclear reactions involving few-nucleon systems.
© Società Italiana di Fisica, Springer-Verlag 2003